Don't recheck connected clients in isbanned() (and other isbanned() dos mitigations) (#48583)
Don't recheck connected clients in isbanned() (and other isbanned() dos mitigations) (#48583)

dos mitigation that likely won't fully work but let's see anyways.

backstory:

byond's ban system will automatically ban world/Topic flooders. Sadly updating byond's internal ban list causes isbanned() to get called on all connected clients. Also sadly: it does this every time it sees the world/Topic flood on the same ip, causing every connected client gets checked repeatedly for every flood message world/Topic sees.
WJohn/-tg-station,Thunder12345/-tg-station,anconfuzedrock/tgstation,Jordie0608/tgstation,TheVekter/-tg-station,Fox-McCloud/-tg-station,HippieStation/HippieStation,Thunder12345/-tg-station,CPTANT/-tg-station,Cruix/-tg-station,coiax/-tg-station,tgstation/-tg-station,HippieStation/HippieStation,TheVekter/-tg-station,coiax/-tg-station,Cyberboss/tgstation,WJohn/-tg-station,MrStonedOne/tgstation,MrStonedOne/tgstation,Cyberboss/tgstation,XDTM/tgstation,JJRcop/tgstation,JJRcop/tgstation,coiax/-tg-station,JJRcop/tgstation,GunHog/-tg-station,Profakos/tgstation,Profakos/tgstation,ShizCalev/tgstation,infinitystation/-tg-station,GunHog/-tg-station,Razharas/-tg-station,Fox-McCloud/-tg-station,SamuelRowe/-tg-station,GunHog/-tg-station,XDTM/tgstation,JJRcop/tgstation,Razharas/-tg-station,CPTANT/-tg-station,HippieStation/HippieStation,optimumtact/-tg-station,Jordie0608/tgstation,JJRcop/tgstation,GunHog/-tg-station,Thunder12345/-tg-station,erwgd/-tg-station,GunHog/-tg-station,nicbn/tgstation,ShizCalev/tgstation,Cruix/-tg-station,SamuelRowe/-tg-station,HippieStation/HippieStation,Arianya/tgstation,nicbn/tgstation,ShizCalev/tgstation,Mark9013100/tgstation-m9,MrStonedOne/tgstation,MicroWorldwide/SS13-TG-station,QualityVan/tgstation,MicroWorldwide/SS13-TG-station,TalkingCactus/tgstation,tgstation/-tg-station,CPTANT/-tg-station,Arianya/tgstation,Bawhoppen/-tg-station,kingofkosmos/-tg-station,XDTM/tgstation,TheVekter/-tg-station,infinitystation/-tg-station,kingofkosmos/-tg-station,Thunder12345/-tg-station,ShizCalev/tgstation,anconfuzedrock/tgstation,Arianya/tgstation,nicbn/tgstation,Bawhoppen/-tg-station,anconfuzedrock/tgstation,Razharas/-tg-station,XDTM/tgstation,optimumtact/-tg-station,Arianya/tgstation,tgstation/tgstation,QualityVan/tgstation,tgstation/-tg-station,JJRcop/tgstation,Arianya/tgstation,MrStonedOne/tgstation,kingofkosmos/-tg-station,tgstation/tgstation,Arianya/tgstation,GunHog/-tg-station,MrStonedOne/tgstation,QualityVan/tgstation,optimumtact/-tg-station,nicbn/tgstation,kingofkosmos/-tg-station,Fox-McCloud/-tg-station,HippieStation/HippieStation,Jordie0608/tgstation,tgstation/tgstation,HippieStation/HippieStation,Cruix/-tg-station,TalkingCactus/tgstation,optimumtact/-tg-station,MrStonedOne/tgstation,infinitystation/-tg-station,infinitystation/-tg-station,XDTM/tgstation,SamuelRowe/-tg-station,GunHog/-tg-station,tgstation/-tg-station,Jordie0608/tgstation,MicroWorldwide/SS13-TG-station,Bawhoppen/-tg-station,tgstation/tgstation,nicbn/tgstation,optimumtact/-tg-station,Razharas/-tg-station,Thunder12345/-tg-station,Bawhoppen/-tg-station,Mark9013100/tgstation-m9,anconfuzedrock/tgstation,Bawhoppen/-tg-station,QualityVan/tgstation,anconfuzedrock/tgstation,kingofkosmos/-tg-station,Thunder12345/-tg-station,Profakos/tgstation,CPTANT/-tg-station,Razharas/-tg-station,coiax/-tg-station,Cyberboss/tgstation,Arianya/tgstation,Cruix/-tg-station,kingofkosmos/-tg-station,erwgd/-tg-station,ShizCalev/tgstation,SamuelRowe/-tg-station,Fox-McCloud/-tg-station,MicroWorldwide/SS13-TG-station,WJohn/-tg-station,CPTANT/-tg-station,MicroWorldwide/SS13-TG-station,Cyberboss/tgstation,coiax/-tg-station,erwgd/-tg-station,Cyberboss/tgstation,Cyberboss/tgstation,TheVekter/-tg-station,WJohn/-tg-station,tgstation/tgstation,CPTANT/-tg-station,TheVekter/-tg-station,infinitystation/-tg-station,XDTM/tgstation,coiax/-tg-station,Cyberboss/tgstation,Profakos/tgstation,Mark9013100/tgstation-m9,Cruix/-tg-station,Jordie0608/tgstation,anconfuzedrock/tgstation,Cruix/-tg-station,Cruix/-tg-station,Jordie0608/tgstation,QualityVan/tgstation,Bawhoppen/-tg-station,Mark9013100/tgstation-m9,HippieStation/HippieStation,anconfuzedrock/tgstation,Cruix/-tg-station,QualityVan/tgstation,Mark9013100/tgstation-m9,Jordie0608/tgstation,CPTANT/-tg-station,Thunder12345/-tg-station,WJohn/-tg-station,ShizCalev/tgstation,JJRcop/tgstation,ShizCalev/tgstation,optimumtact/-tg-station,Fox-McCloud/-tg-station,TalkingCactus/tgstation,MrStonedOne/tgstation,TheVekter/-tg-station,Razharas/-tg-station,MrStonedOne/tgstation,optimumtact/-tg-station,infinitystation/-tg-station,Fox-McCloud/-tg-station,Razharas/-tg-station,Profakos/tgstation,WJohn/-tg-station,XDTM/tgstation,Jordie0608/tgstation,infinitystation/-tg-station,Razharas/-tg-station,MicroWorldwide/SS13-TG-station,tgstation/tgstation,infinitystation/-tg-station,Profakos/tgstation,Mark9013100/tgstation-m9,nicbn/tgstation,MicroWorldwide/SS13-TG-station,tgstation/tgstation,Fox-McCloud/-tg-station,coiax/-tg-station,Profakos/tgstation,CPTANT/-tg-station,TalkingCactus/tgstation,Bawhoppen/-tg-station,Bawhoppen/-tg-station,ShizCalev/tgstation,TheVekter/-tg-station,kingofkosmos/-tg-station,Mark9013100/tgstation-m9,WJohn/-tg-station,MicroWorldwide/SS13-TG-station,nicbn/tgstation,QualityVan/tgstation,tgstation/tgstation